code: def test_none_id_to_uid():
      class MockRecord(_Validators):
          id: Optional[str] = None
  
      record = MockRecord()
      assert isinstance(record.id, str)
  
imports: import datetime
  import json
  import uuid
  from typing import Any, Optional
  import numpy
  import pandas
  import pytest
  from argilla.client.models import Text2TextRecord, TextClassificationRecord, TokenClassificationRecord, _Validators
  from pydantic import ValidationError
label_desc: Use image node_id 15 for calling a global function with example usage: test_none_id_to_uid() without return types